Combination spark gap and plug.



A. L. RYDBR.

COMBINATION SPARK GAP AND PLUG.

APPLICATION ILBD MAY 15. 1907.

fammi sept; 7. 1909.

i MM j ARTHUR L. BYDER, 0F lASADEN. CALIEORNIA.

COMBINATION SPARK GAP AND PLUG.

Application tiled May 15, 1907.

Specification of Letters Patent.

Patent-ed Sept. 7, 190i).

seran No. 373,870.

Llo all whom it may concern:

lie it known that I, ARTHUR L. ltrnnn, a citizen ot' the United States, residing at laszulcnn, iu the county of Los Angeles and State of California, have invented a new and useful (.olubination Spark Gap and Plug, of which the follo\\.ing is a specification.

The object of this invention is to provide an improvement in spark plugs for internal combustion engines in which the operator ot' such engine-muy be able to at any time observe the workiiw of the spark-plug, and whereby the intenstyof the ignitln'g s 1ark inside the engine may be increased.I his .spark-plug is ada ted to utilize in a cheap, strong simple an compact construction the principle of the double-jump-spark.

An object of the invention 1s to make provision for ready and accurate adjustment of the length of the spark-gap under the inspection ofthe operator.

The spark plu comprises conducting elements and insu ating "elements, some of,

- which are well known and `some of which fit) are new. The conducting` elements ma be made of any conducting material w l known iii the art or any equivalent therefor, and the insulating elements 'may be made of any well known insulating material.

In oonstructin the spark plug as the saine will be illustra d in the accompanying drawings, porcelain, fiber, glass, hard rubber, mica, asbestos, and other .substances may be used for various insulating parts thereof and I do not limit the invention to any particular kind or kinds of material.

The accompanying drawings illustrate the invention. i

Figure 1 is a view of the spark-plug detached. Fig. 2 is an axial s ctlon on line indicated by wz-fFigs. 1 `nd Fig. 3 is a plan section 4on line :ca-fu, Fi s. 1 and 2.

1 is the usual hollow hexdgona body portion rovided with the externally screwthrea l ed hollow stem 2 to screw into the engine-body, not shown, and also provided with the externally and internally. screwthreaded collar'3 to receive the insulation 4 and the bushing orvgland 5 which holds the same in place. ,Y

G is a sleeve provided with screw-threads internally, to engage the external screw-` threads of the collar 3, and also provided in- 'teriorly with a shoulder 7.

8 is a housing in the form of a tubular body of insulating material provided with lateral sight openings 9 and with a central opening l() arranged to accommodate the adJustuble 1gn1ter-bar sectlon 11 having a pointed end 12 extending into the cavity of fthe hollow body 8 and forming one point of thc sparker. This hollow body 8 is insulated from the gland 5 by the insulating-ring 13.

1-land 28 are nuts for binding the terminal of the wire 15.

16 indicates packing of insulating material as thin mica sheets to prevent moisture from entering the housing through the end of the hollow body or cap 8, and `to form a cushion between nut 2,8 and the housing 8.

17 is an igniter-bar section terminating inside thecavity o f the body 8 in a spark-point 18 located in proximity to the spark-point 12, the shank of said lgniter-bar being inclosed in a vitreous body or insulating s eeve 19 provided with a shoulder 20 which rests on a suitable shoulder '21 provided on the interior of the hollow hexagonal body porn tion.

22 is an insulating ring.

23 'is a stem extension of the insulated igniterV bar; section 17 and terminates in a spark-point 24 in proximity to spark-point 25'that may be formed s an extension of the screw-threaded endl 2 of the hexagonal body 1. The space between the forms the spark-gap by which the spark for igniting the charge in the engine cylinder will be formed. l

26 is a sleeve forming a socket or seat for the i niter-bar 11, and is externally and interna l screw-threaded and extends throu l1 the en of the cap or hollow insulating bo y 8, and is provided inside said body with a circular head 27. Said socket. is secured in place by said nut 28 screwed on the sleeve 26 against the insulation 16, thereby clam ing the socket formed by the sleeve Q6 an the head 27 iirnily in place. The nut 14 is screwed onto the sleeve 26 to bind the conductor 15 firmly in place, the sleeve 26`serving as a binding-post. The internal i niterbar-section 17 is provided with a shou der 29 which engages the insulation 22 and said section 17 is provided at its inner end with a screw-threaded ortion 30 onto which is screwed a nut 31, therebyfirmly securing the igniter section 17 in the porcelain insulator 19.

32 designates a hollow cylindrical insulti-- points 24 and 25 lou section 11 is provi ed with a slot or kerf 33 `to receive a screw-driver for adjustment.

a' vent esca e of The operator can readily adjust the width of the s ark-gap between points 12 and 18 by ls'irnp y turning the section 1l.

34 designates a packing of asbestos be tween the enlarged portion and the metallic hexagonal body 1 to hold the insulator 19 firmly in place against rattlin and to preas around the eeve 19.

By ma ing t e cap 8 of glass the need of the openin s 9 might be dispensed with as also the ho low mica cylinder 32V, the pury poso of said mica and the openings 9 being to allow the spark ap between he open to lview w ile electrically insulated il'om the external air. i

In. practical use, in case of trouble with `the igniting ap aratus provided with this form cf spark-p ug, the attendant can determine by inspectin the. ga between 'the spark-points 12 am? 18, whet er the trouble is caused by foulin of the iriner sparkpoints. If it is noted that the ^sparking occurs between 12 and 18 without causing igniti -n o-f-the charge in the e 'ne, this indicatesthat the troubleis insi e the plug and can be remedied bv unscrewing the plu and cleaning the sparloints 24 and 25 'if theA same are found to e' foul. In addition to this, the duplication of the gaps causes greater intensity of spark between the sparkpoints 24 and 25, as is well kn'ov'vn in the art. In case of any breakage ofthei porcelain member 19, or of injury to the Vpacking of the plug, 'this may be remedied by unsc'rewing the sleeve 6 and thus aining access to `the interior of the plug. he replacing or readjusting of any of the parts can 'be readily accom lished as is apparent from inspection of PPig. 2 of the-drawings.

1. A- spark plug com rising a hollow externally screw-threade body adapted to screw into the enginebody and provided with an externall and internally' screwthreaded collar endian internal shoulder, insulation within the hollow body, vpackin urolnd the insulation, a land screw-sea within the collar against t e packing to hold the insulation in` lace, a tubular' hody of insulating materia around the upper 4end of the first insulation and :havin transverse openings, a transparent cylindefwithin the tubular .body nd coverilzgsaid openings, an internally screwthreade 'sleeve screw-seat- 12 and 1S to -lation mounted in the' hollow openings through the threaded collar and an internal shoulder, in-

sulation within the hollow body, packin around the insulation, a land screw-sente within the collar against t e packin to hold the insulationin lace, a tubulargbody of insulating materialparound the upper end of the first insulation and having transverse openings, a transparent cylinder within this tubular body and oo veri said openings, an internally screw-threade sleeve screw-seated u on -the external threads of thecollar and iavin a shoulder holding the tubular insulating ody in place, an lgniter `bar in the insulation within the hollow bod and terminating 1n a point visible throng said openings, and a second igniter bar extending downwardly through the tubular body, saldsecond'igniter bar bein ad'ustable.

3. In a vspark plug, a hol ow y exte nally screw-threaded` at its lower end for insertion into the engine-body and having an intgrnal shoulder and up ardlyfextending externall and' inter,- nally screw-threaded collar, abo

dy 'and shoulders, there bei packin the shoulders; a glarrl inserte downwardl into the collar to hold the insulation b vin place, a second tubular insulation body extending upwardly from around the upper-end of the first insulation body, a sleeve screw-seated upon the collar and havin a shoulder holding the' second insulation ody inpla, there being sightsecond insulation body; a transparent` cylinder within vthe second insulation body covering said sighto enin ,'an i iter bar extending upwardly tlroug the rst insulation and an igniter bar extending' downwardly through the secondinsulation, the points of theigniter bars being visible through the sight-openings, and the upper bar bemffadjustable.

In testimony whereo II have hereunto set havingr aroun my hand a'tLos Angeles California this 9th day of May 1907. A. L. RYDER. In presence of J AMES R. TowNsnNn, Enr'rnn TowNsnNm provided with anA 

